Aplication of ultra-high resolution, multiplexedfiber optic strain sensor for monitoring coupled deformation/fluid flow process in rock mass

2011 Fiscal Year Final Research Report

• Project/Area Number: 21246133
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Earth system and resources enginnering
• Research Institution: The University of Tokyo
• Principal Investigator: TOKUNAGA Tomochika 東京大学, 大学院・新領域創成科学研究科, 教授 (70237072)
• Co-Investigator(Kenkyū-buntansha): HE Zuyuan 東京大学, 大学院・工学系研究科, 特任教授 (70322047) ; MATSUI Hiroya 独立行政法人日本原子力研究開発機構, 地層処分研究開発部門, 研究副主幹 (30421655)
• Research Collaborator: BEPPU Terukazu アサノ大成基礎設計株式会社, 技術研究所 ; KASHIWAI Yoshio 大成基礎設計株式会社, 技術研究所 ; MOGI Katsuro 東京大学, 大学院・工学系研究科, 技術専門職員 ; AICHI Masaatsu 東京大学, 人工物工学研究センター, 特任助教 ; LIU Qingwen 東京大学, 大学院・工学系研究科, 博士課程学生
• Project Period (FY): 2009 – 2011
• Keywords: 地球計測 / フォトニックセンシング

Research Abstract

Ultra-high resolution fiber-optic strain sensor was developed, and we demonstrated the static-strain resolution of the developed sensor to be 2. 6×10^<-9>. The sensor was applied to the actual rock mass environment at Aburatsubo, Japan, and we successfully measured the strain on the order of ten nano-strain, of which baseline length was 1 m. We also derived thermodynamically consistent constitutive equations for the coupled two-phase flow and deformation processes of porous media, and developed a numerical simulator based on the derived constitutive equations.

Research Products

• [Journal Article] Sub-nano resolution fiber-optic static strain sensor using a sideband interrogation technique (2012)
  • Author(s): Liu, Q., Tokunaga, T. and He, Z.
  • Journal Title: Optics Letters Volume: 37 Pages: 434-436
  • Peer Reviewed
• [Journal Article] 多孔質弾性体中の二相流・変形連成過程の定式化-現状と今後の課題・展望- (2012)
  • Author(s): 愛知正温・徳永朋祥
  • Journal Title: 地学雑誌 Volume: 121 Pages: 39-52
  • Peer Reviewed
• [Journal Article] Realization of nano static strain sensing with fiber Bragg gratings interrogated by narrow linewidth tunable lasers (2011)
  • Author(s): Liu, Q., Tokunaga, T. and He, Z.
  • Journal Title: Optics Exp Volume: 19 Pages: 20214-20223
  • Peer Reviewed
• [Journal Article] Ultra-high-resolution large-dynamic-range optical fiber static strain sensor using Pound-Drever-Hall technique (2011)
  • Author(s): Liu, Q., Tokunaga, T. and He, Z.
  • Journal Title: Optics Lett Volume: 36 Pages: 4044-4046
  • Peer Reviewed
• [Journal Article] Thermodynamically consistent anisotropic constitutive relations for a poroelastic material saturated by two immiscible fluids (2011)
  • Author(s): Aichi, M. and Tokunaga, T.
  • Journal Title: Intern. J. Rock Mech. Min. Sci Volume: 48 Pages: 580-584
  • Peer Reviewed
• [Journal Article] Ultra-high resolution multiplexed fiber Bragg Grating Sensor for Crustal Strain Monitoring
  • Author(s): Liu, Q., Tokunaga, T., Mogi, K., Matsui, H., Wang, H. F., Kato, T. and He, Z.
  • Journal Title: IEEE Photonics Journal Volume: (in press)(掲載確定)
  • Peer Reviewed
• [Presentation] Field demonstration of 10-nano static strain resolution multiplexed FBG sensor for geophysical applications (2012)
  • Author(s): Liu, Q., Tokunaga, T., Mogi, K., Matsui, H., Wang, H. F., Kato, T. and He, Z.
  • Organizer: 3rd Asia-Pacific Optical Sensors Conference, Sydney
  • Place of Presentation: Sydney
  • Year and Date: 2012-01-31
• [Presentation] An ultra-high-resolution large-dynamic-range fiber optic static strain sensor using Pound-Drever-Hall technique (2011)
  • Author(s): Liu, Q., He, Z., Tokunaga, T. and Hotate, K.
  • Organizer: 2011 CLEO Pacific Rim Conference
  • Place of Presentation: Sydney
  • Year and Date: 2011-08-29
• [Presentation] Realization of nano-strain-resolution fiber optic static strain sensor for geo-science applications (2011)
  • Author(s): He, Z., Liu, Q. and Tokunaga, T.
  • Organizer: CLEO 2012
  • Place of Presentation: Ottawa
  • Year and Date: 2011-05-18
• [Presentation] Deep underground instrumentation and monitoring (2010)
  • Author(s): Wang, H. F., Gage, J. R., Fratta, D., MacLaughlin, M., Murdoch, L. C. and Tokunaga, T.
  • Organizer: Proc. 6th Asian Rock Mech. Symp.
  • Place of Presentation: New Delhi
  • Year and Date: 2010-10-25
• [Presentation] Studies on deformation/pore pressure coupling processes at Japanese URLs and the development of ultra-high resolution FBG strain sensors for rock mechanics (2009)
  • Author(s): Tokunaga, T., Matsui, H., He, Z., and Kashiwai, Y.
  • Organizer: American Geophysical Union
  • Place of Presentation: Fall Meeting, San Francisco
  • Year and Date: 2009-12-15
• [Remarks]
  • URL: http://www.u-tokyo.ac.jp/coe/japanese/achievements/category2/base5/report05-03.html